Germany tennis star Alexander Zverev doesn’t expect to be back at full strength until next season due to the after-effects of a pneumonia. “It’s not a matter of one or two weeks. I hope that I’ll be back to 100% by next year when I arrive in Australia (ahead of the Australian Open),” the world number three said ahead of the Vienna Open starting on Monday. Zverev has been suffering from the effects of a pneumonia for some time, complaining of fever and cough at the Laver Cup in Berlin just over a month ago. He subsequently withdrew from the China Open in Beijing late in September and recently f…